MichSpace

For all you history buffs out there, http://spacelog.org has you covered. Recently NASA has been releasing transcripts from their early missions. Currently, you can read the Apollo 13 ('Houston, we have a problem') and Mercury 6 (John Glenn became the first American to reach Earth orbit) transcripts. The format itself is pretty cool. They don't just throw the transcript out there, they have a play-by-play of who's saying what. They are working on adding more missions... in fact, they're looking for more people to help them digitize!